Aparna J, Maiti Subhabrata, Jessy P
Department of Prosthodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, Tamil Nadu, India.
Department of Pedodontics, Saveetha Dental College and Hospitals, Saveetha Institute of Medical and Technical Sciences, Saveetha University, Chennai, Tamil Nadu, India.
J Conserv Dent. 2021 Nov-Dec;24(6):553-557. doi: 10.4103/jcd.jcd_638_20. Epub 2022 Apr 1.
This study was aimed to analyze the stress generation and distribution for "polyether ether ketone (PEEK)" and metal cobalt-chromium (Co-Cr) at different locations of the tooth using finite element analysis (FEA), when they are casted-off as "Richmond crowns."
The model of the tooth was designed using "computer-aided design/computer-aided manufacturing" followed by generating the "Mesh" of the tooth to analyze the stress caused by applying vertical and oblique loads of 100N and 40N, respectively, in cubical nodes for both PEEK and metal endodontic post-based Richmond crown. The "3-dimensional von Mises criteria" was used to compare stresses of both elements using FEA. The material properties for each component were designated by respective modulus of elasticity and Poisson's ratio. The statistical test of the stress generation in various locations of PEEK and Metal (Co-Cr) Richmond crown was done by independent -test.
From the FEA analysis of Richmond crown, it is evident that maximum stress was generated by "Metal" of about 66.418 MPa when compared to "PEEK" (15.826 MPa). "PEEK Richmond crown" produced minimal stress on the tooth and the other surrounding regions than "Metal Richmond crown" with a statistically significant difference ( < 0.05).
The results proved that the "Metal Richmond crown" postsystem had a tendency to produce more stress on the tooth and the other surrounding regions than the PEEK. The FEA proved the pros of using "PEEK post Richmond crown," which is a big boon for the modern era dentistry.
本研究旨在通过有限元分析（FEA），分析当“聚醚醚酮（PEEK）”和金属钴铬合金（Co-Cr）制成“里士满冠”并在牙齿不同位置铸造时的应力产生和分布情况。
使用“计算机辅助设计/计算机辅助制造”设计牙齿模型，随后生成牙齿的“网格”，以分析在立方节点中分别施加100N垂直载荷和40N斜向载荷时，PEEK和基于金属根管桩的里士满冠所产生的应力。使用“三维冯·米塞斯准则”通过有限元分析比较两种材料的应力。每个组件的材料属性由各自的弹性模量和泊松比指定。通过独立样本t检验对PEEK和金属（Co-Cr）里士满冠不同位置的应力产生情况进行统计检验。
从里士满冠的有限元分析可知，与“PEEK”（15.826MPa）相比，“金属”产生的最大应力约为66.418MPa。“PEEK里士满冠”在牙齿及其他周围区域产生的应力比“金属里士满冠”小，差异具有统计学意义（P<0.05）。
结果证明，“金属里士满冠”桩系统在牙齿及其他周围区域产生的应力比PEEK更大。有限元分析证明了使用“PEEK桩里士满冠”的优点，这对现代牙科来说是一大福音。
